配置HttpMessageConverter

    <bean id="mappingJacksonHttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>

    <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
        <constructor-arg value="UTF-8" index="0"/>
        <property name="supportedMediaTypes">
            <list>
                <value>text/plain;charset=UTF-8</value>
            </list>
        </property>
        <property name="writeAcceptCharset">
            <value>false</value>
        </property>
    </bean>

    // 对AnnotationMethodHandlerAdapter配置没有效果
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="stringHttpMessageConverter" />
                <ref bean="mappingJacksonHttpMessageConverter"/><!-- json转换器 -->
            </list>
        </property>
    </bean>

    <mvc:annotation-driven>
        <!-- 中文乱码 -->
        <mvc:message-converters register-defaults="true">
            <!-- 自定义的converter必须在这里注册，不然是不会有效的 -->
            <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
            <ref bean="stringHttpMessageConverter" />
            <ref bean="mappingJacksonHttpMessageConverter" />
        </mvc:message-converters>
    </mvc:annotation-driven>

前三个是在mvc:message-converters标签注册的，后七个则是默认的（当register-defaults="true"时）

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